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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Diana Hirning-Johnson, MFT

Marriage & Family Therapist in Davis, CA · enumerated 2010.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1639409725

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Registry record

Entity type Individual (Type 1)
Name Diana Hirning-Johnson
Credential MFT
Sex Female
Practice address Davis, CA, 95616
Phone (530) 304-0146
Fax (530) 753-9469
Enumeration date Jan 12, 2010
Last updated in NPPES Jan 12, 2010

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License MFC41611 (CA) Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
What specialty is Diana Hirning-Johnson?
Diana Hirning-Johnson is registered in NPPES with the primary taxonomy of Marriage & Family Therapist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-01-12.